It's quite likely that Google will appear somewhere in your personal search strategy for finding resources or literature for your subject or research interest. It goes without saying that as a graduate student your search strategy should probably not start and end with Google, but there are ways in which you can improve the way you search it.
Some excellent advice on using Google Scholar more effectively is available here.
It's also possible that you'll be using Twitter quite regularly, and you might occasionally want to search it. There is an advanced search functionality but there are some other strategies you can use to find better results through its normal search box:
More information about ways to search Twitter is available in this excellent thread.
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